PostgreSQL 12.1, compiled by Visual C++ build 1914, 64-bit
Windows 10
Query:
select jsonb_path_query('{"data": [{"key": "value"}]}', '$.**.key')
Actual output:
jsonb_path_query
------------------
"value"
"value"
(2 rows)
Expected output:
jsonb_path_query
------------------
"value"
(1 row)